80445517 has 2 divisors, whose sum is σ = 80445518. Its totient is φ = 80445516.

The previous prime is 80445503. The next prime is 80445593. The reversal of 80445517 is 71554408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77686596 + 2758921 = 8814^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 80445517 - 2¹¹ = 80443469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80445017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40222758 + 40222759.

It is an arithmetic number, because the mean of its divisors is an integer number (40222759).

Almost surely, 2^80445517 is an apocalyptic number.

It is an amenable number.

80445517 is a deficient number, since it is larger than the sum of its proper divisors (1).

80445517 is an equidigital number, since it uses as much as digits as its factorization.

80445517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 80445517 is about 8969.1424896698. The cubic root of 80445517 is about 431.6853221781.

The spelling of 80445517 in words is "eighty million, four hundred forty-five thousand, five hundred seventeen".